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percpu: expose pcpu_nr_empty_pop_pages in pcpu_stats

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Percpu memory holds a minimum threshold of pages that are populated
in order to serve atomic percpu memory requests. This change makes it
easier to verify that there are a minimum number of populated pages
lying around.

Signed-off-by: Dennis Zhou <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>
This commit is contained in:
Dennis Zhou (Facebook) 2017-07-15 22:23:08 -04:00 • committed by Tejun Heo
commit 6b9b6f3994
3 changed files with 3 additions and 1 deletions
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2
mm/percpu.c
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@ -160,7 +160,7 @@ static LIST_HEAD(pcpu_map_extend_chunks);
* The number of empty populated pages, protected by pcpu_lock. The
* reserved chunk doesn't contribute to the count.
*/
static int pcpu_nr_empty_pop_pages;
int pcpu_nr_empty_pop_pages;
/*
* Balance work is used to populate or destroy chunks asynchronously. We